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(0.50-0.20)x=6.00+3.00
We move all terms to the left:
(0.50-0.20)x-(6.00+3.00)=0
We add all the numbers together, and all the variables
(0.3)x-9=0
We multiply parentheses
0.3x-9=0
We move all terms containing x to the left, all other terms to the right
0.3x=9
x=9/0.3
x=30
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